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suppeementailOS!
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Tosecond radiatorpair
13
Ve'!'ladeuxiemepai.. de
rad,ateurs
General
The Infrared transmitter SI 1010 serves for wlreless
transmission of audlo signals by means of a light
modulating carrier of 95 kHz The unit is dellvered
with four radiators, type SZI101O and a mains cable,
type VZN 1010.
Installation
Place transmitter CD In a suitable location (control
room, rack etc)
Mount the four radiators @ on suitable tripods or
brackets. Each radiator has a %" thread @ at the
bottom.
Dlrect the radiators for even distribution of the
emitted Infrared light in the room used for trans-
mission. Avoid shadowing by obstacles or persons I
Connect the radiators in pa Ir s to the "Lumin. Diode
Outputs" @ of the transmitter. Connection cables @
of the type GZL 1010 are available as optional
accessones from Sennheiser electronic.
If In certain cases only two radiators are required
each of the radiators should be connected to 0 n e
output.
Operation
Insert malns plug @ into 220 volt outlet.
Switch on unit by depressing power switch @. The
yellow LED @ indicates the ready - mode of the
transmitter.
Check the functlon of each radiator connected. The
red indicator diode @ must light up.
Connect
0 n e signal source to the transmitter
High
level signals
(mixers, preamplifiers,
tape
recorders) to the UNE input @, microphones to the
MIC input @. The sWltch @ is put in position "Dyn"
when dynamic mlCiophones are used and in position
"Cond" for 12 V A~B powered condenser micro-
phones. The diode T 12 Cf) lights up only when a
condenser microphone ISconnected.
Simultaneous operation of both inputs is not provlded
since the MlC-input is designed for prionty operation.
If a plug is inserted into the MIC-input @ the signal
connected to the Line-input @ is attenuated by
approxlmately 40 dB.
Modulation
With the deviation control @ the modulation is
optimally set. This is obtained when at volume peaks
all green diodes @ light up and a nominal deviation
of :f:: 40 kHz is reached. Further increase of input
level is indicated by the first red diode @ meaning
that nominal deviation is exceeded. When peak
deviation of :t 50 kHz is reached, both red dlodes
@ light up
This indicates that now a control-amplifier limits the
deviation. This limiting amplifier is capable to accept
signals of approximately 40 dB above nominal
deviation without producing a noticeable increase in
distortion In splte of thls ample margln of headroom
It ISt not recommended to operate the transmitter
In thls mode slnce the dynamlc range is naturally
compressed.
Special operating
conditions
Satisfactory infrared transmission depends upon the
amount of interferlng light In the room and upon its
size. It can therefore become necessary in larger
rooms (approximately larger than 200 m2) and to
Improve the signal to nOlse ratio to connect several
transmitters In parallel. The number of effectlve
radiators ISthus also multiplied.
Transmitters must be parallel-connected
with a
sync-cable. The sync-output @ of the master unit IS
connected to the sync-input @ of a slave-transmitter
and so on. A total of three unlts rTJaybe intercon-
nected resulting in a number
of 12
radiators for a
large room.
Length of Cables
T0 test the function of the total system the 4 radiators
may be dlrectly - without extension cable
-
be
connected to a transmitter As option al accessones
the radiator connection cables GZL
1010
@ with a
length of 10 mare
available from Sennheise:
electronic Nevertheless, connectlon cables can be
made up by the user or a qualified person in a
length more suitable for the intended installation.
For proper operation of the system it is of great
importance that only cable material of the type
LiYCY
4 x 0.25/25
ist used. This matenal may be
ordered from Sennheiser and IS order-coded:
LV 12-1022.
Important:
Self-made cables must not exceed the
maximum length given in the table. Proper operation
can only be expected if the values given are obeyed.
Choice of microphones
It IS recommended to use dynamic microphones
with a standard sensitivity of 0.2 mV/flbar if the
mlcrophone is spoken into from a close distance.
The switch @ must be in the position "Dyn." The in-
dicator diode for the A-B feed "T 12" must
not
light. The use of condenser microphones for 12 V
A-B powering e. g. MKH 415 T is recommended if
more distant sound sources have to be trans-
mitted (e. g. stage plays etc.).
The powering switch @ ISt then to be put in the
position "Cond". The indicator diode "T 12" Cf)must
light when a condenser microphone i s co n n e c-
ted
The choise of a suitable mlcrophone helps
to avoid modulation problems when operating the
transmitter.
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